package com.emellend.api.expandablelist;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;
import android.widget.TextView;
import android.widget.Toast;
/**
 * 最简单的可展开listview，长按条目时，弹出吐司提示，内容为当前条目在组中的位置信息
 * @author emellend
 *
 */
public class ExpandableList1 extends ExpandableListActivity {
	private MyExpandableListAdapter mAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		mAdapter = new MyExpandableListAdapter();
		setListAdapter(mAdapter);
		registerForContextMenu(getExpandableListView());
	}
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		menu.setHeaderTitle("Sample menu");
		menu.add(0, 0, 0, "Sample action");
	}
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
		String title=((TextView)info.targetView).getText().toString();
		int type = ExpandableListView.getPackedPositionType(info.packedPosition);
		if (type==ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
			int groupPos=ExpandableListView.getPackedPositionGroup(info.packedPosition);
			int childPos=ExpandableListView.getPackedPositionChild(info.packedPosition);
			Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos,
                    Toast.LENGTH_SHORT).show();
			return true;
		}else if (type==ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
			 int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition); 
	         Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show();
	         return true;
		}
		return false;
	}
	private class MyExpandableListAdapter extends BaseExpandableListAdapter{
		private String[] groups = { "People Names", "Dog Names", "Cat Names", "Fish Names" };
		private String[][] children = {
                { "Arnold", "Barry", "Chuck", "David" },
                { "Ace", "Bandit", "Cha-Cha", "Deuce" },
                { "Fluffy", "Snuggles" },
                { "Goldy", "Bubbles" }
        };
		public int getGroupCount() {
			return groups.length;
		}

		public int getChildrenCount(int groupPosition) {
			return children[groupPosition].length;
		}

		public Object getGroup(int groupPosition) {
			return groups[groupPosition];
		}

		public Object getChild(int groupPosition, int childPosition) {
			return children[groupPosition][childPosition];
		}

		public long getGroupId(int groupPosition) {
			return groupPosition;
		}

		public long getChildId(int groupPosition, int childPosition) {
			return childPosition;
		}

		public boolean hasStableIds() {
			return true;
		}
		
		public boolean isChildSelectable(int groupPosition, int childPosition) {
			return true;
		}
		
		public View getGroupView(int groupPosition, boolean isExpanded,
				View convertView, ViewGroup parent) {
			TextView textView=getGenericView();
			textView.setText(getGroup(groupPosition).toString());
			return textView;
		}

		public View getChildView(int groupPosition, int childPosition,
				boolean isLastChild, View convertView, ViewGroup parent) {
			TextView textView=getGenericView();
			textView.setText(getChild(groupPosition, childPosition).toString());
			return textView;
		}

		
		public TextView getGenericView() {
			AbsListView.LayoutParams params=
					new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,64);
			TextView textView=new TextView(ExpandableList1.this);
			textView.setLayoutParams(params);
			textView.setGravity(Gravity.CENTER_VERTICAL|Gravity.LEFT);
			textView.setPadding(36, 0, 0, 0);
			return textView;
		} 
		
	}
	
}
